C # opens PPT and responds automatically to clients

Using Mscore = Microsoft.Office.Core;
Using msppt = Microsoft.Office.Interop.PowerPoint;

namespace Word
{
public partial class Form1:form
{
Public Form1 ()
{
InitializeComponent ();
}
private void Button1_Click (object sender, EventArgs e)
{
Msppt. ApplicationClass Pptac;
Msppt. Presentation Pptpre;
Pptac = new Msppt. ApplicationClass ();
Pptpre = PptAC.Presentations.Open (@ "C:\123.pptx", Mscore. Msotristate.msotrue, Mscore. Msotristate.msotrue, Mscore. Msotristate.msofalse);
Pptac.activate ();
Pptpre.newwindow ();
Pptac.presentationbeforesave + = new msppt. Eapplication_presentationbeforesaveeventhandler (Pptac_presentationbeforesave);
}
private void Pptac_presentationbeforesave (msppt. Presentation pp,ref bool Cancel)
{
MessageBox.Show ("Hello Excel");
}
}
}

C # opens PPT and responds automatically to clients